Xulrunner based applications could be made to crash or run programs as yourlogin if they opened a specially crafted file.

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Ubuntu Security Notice USN-1367-4
February 17, 2012
xulrunner-1.9.2 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.10
- Ubuntu 10.04 LTS
Summary:
Xulrunner based applications could be made to crash or run programs as your
login if they opened a specially crafted file.
Software Description:
- xulrunner-1.9.2: Mozilla Gecko runtime environment
Details:
USN-1367-1 fixed vulnerabilities in libpng. This provides the corresponding
update for Xulrunner.
Original advisory details:
Jueri Aedla discovered that libpng did not properly verify the size used
when allocating memory during chunk decompression. If a user or automated
system using libpng were tricked into opening a specially crafted image,
an attacker could exploit this to cause a denial of service or execute
code with the privileges of the user invoking the program. (CVE-2011-3026)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 10.10:
xulrunner-1.9.2 1.9.2.27+build1+nobinonly-0ubuntu0.10.10.1
Ubuntu 10.04 LTS:
xulrunner-1.9.2 1.9.2.27+build1+nobinonly-0ubuntu0.10.04.1
After a standard system update you need to restart any application based on
Xulrunner such as Yelp or Conkeror to make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1367-4
http://www.ubuntu.com/usn/usn-1367-1
CVE-2011-3026, https://launchpad.net/bugs/934073
Package Information:
https://launchpad.net/ubuntu/+source/xulrunner-1.9.2/1.9.2.27+build1+nobinonly-0ubuntu0.10.10.1
https://launchpad.net/ubuntu/+source/xulrunner-1.9.2/1.9.2.27+build1+nobinonly-0ubuntu0.10.04.1